Campbell Biology (10th Edition)

Chapter 9 - 9.2 - Concept Check: 1

Answer

The oxidizing agent is $NAD^{+}$, and the reducing agent is G3P.

Work Step by Step

The key here is to recall that what is reduced, the oxidizing agent, starts with fewer hydrogens than it ends up with, and the oxidizing agent sees the opposite change. Additionally, reduction can be thought of as a reduction of positive charge specifically by addition of electrons (on these hydrogens).